I encountered an issue with a Samsung LCD TV model UA32F4088AR, where the screen had no picture and no display. After powering on, I checked the LED constant current board and found that it was receiving 135V of voltage, but the screen still didn't light up. Upon further inspection, I discovered that the LED strips were connected in series, and if even one LED was damaged, the entire strip would fail. I disassembled the screen and tested each power supply section one by one. I found that one of the light bars wasn’t lighting up properly, and upon closer examination, I noticed that one specific LED on the edge wasn’t working either. This led me to conclude that this was the faulty component causing the problem. The TV uses five light bars, each containing nine LEDs, totaling 45 LEDs. The total voltage applied is 135V, so each LED should be operating at around 3V. Initially, I thought about using LED light bars typically used for computer case decoration. These usually have four 12V LEDs, which also equate to approximately 3V per LED. I replaced the faulty part with a normal LED strip from a standard screen, and the brightness of the light-changing section remained almost the same, with no noticeable difference in illumination. Below are some images of the repair process and the components involved:
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